George w



(No Model.)

G. W. DENNIS. .GABLE CLAMP.

No.'544,481 .7MJWN gatentedAug. 13,1895.

\NITN ESSES: INVENTOR:

UNITED STATES PATENT OFFICE.

GEORGE l/V. DENNIS, OF CHICAGO, ILLINOIS, ASSIGNOR TO THOMAS A. HAG- ERTY, HENRY L. WATERBURY, AND ALBERT O. HAWES, OF SAME PLACE.

CABLE-CLAM P.

SPECIFICATION forming art of Letters Patent No. 544,481, dated August is, 1895.

Application filed November 22, 1894. Serial No. 529,591. (No model.)

To all whom it may concern:

Be it known that I, GEORGE W. DENNIS, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Cable- Clamp, of which the following is a specification.

My invention relates to cable-clamps, and

my object is to provide a simple and efficient device for this purpose, which may be very quickly secured to a cable or removed therefrom, and whichis not liable to bruise or th erwise materially injure cables which are covcred with insulating material for electrical purposes, the construction and manner of using being described hereinafter, and is illustrated 1n the accompanying drawings, in

which- 7 Figure l is a side elevation of a clamp in which is embodied my invention, a portion of a cable and the pulling-rope being shown also to illustrate the position of the parts when in use. Fig. 2 is a plan View of the clamp as it appears with the cable and pulling-rope removed. Fig. 3 is an end elevation. Fig. 4 shows, respectively, an end and a side elevation of the top half of the clamp, while Fig. 5 shows, respectively, an end and a side elevation of the. bottom half thereof. Figs. 6 and 7 show, respectively, a top and an inside View of the top half of the clamp.

Similar letters indicate like parts throughout the several views.

In ordinary clamps in use for securing a pulling-rope to an insulated electric cable the parts are usually secured together by means of bolts, which are objectionable in that they require the expenditure of considerable time to manipulate, and then there is a liabilityof injuring the insulation by binding the clamp to the cable too closely, and especially is this true when such work is intrusted to comparatively unskilled help.

This new clamp comprises mainly the portion A having a concavo-convex shape, with a series of wedges B at the sides and integral therewith, which wedges are fitted to slide into and under a series of lugs (J, which are integral with and at the sides of the concaveconvex half, opposite half D, as shown in Figs. 1,2, and 3, the concave faces of the two halves I being disposed so as to form a cylindricallyshaped contour which almost incloses the surface of the cable for a length equal to that of the clamp.

At E is a projecting lug which in a prolongation thereof forms a ridge along a portion of 'the back or convex surface of piece A, the free end of the lug having a hole F to receive a bolt G, which forms the pivotal center upon which is mounted the yoke-lever H, which has one arm of its bifurcated end at each side of lug E, these arms contacting the forward end of the lower half of the clamp at each side of the cable. The pulling-rope is attached, as shown in Fig. 1, at J to the yoke formed by lever H.

'In use the part D (shown as the lower half in the drawings) is first placed with the concave side against the cable, after which the part A is placed with its concave side against the cable at the opposite side from part D and is slid forwardly, with the wedges B in engagement under the inward projections of lugs G, the lever H being in the meantime thrown backwardly to the position shown in the broken lines, Fig. 1, to permit this, after which the lever H is pulled forwardly to the position shown in the solidlines, and being pivoted to the part A and the free ends of 8c the lever being in contact with the end of part D the wedges are drawn in under the projections of lugs O by both the leverage and the direct pull of rope J, which causes the two halves to close upon the cable and firmly grip it with a degree of pressure always adequate to prevent the clamp slipping, and on account of the large extent of surface in contactwith the cable and the pressure being equally distributed thereon there is no 0 danger of injuring a naked cable or the insulation of an ordinary electric cable.

It is obviousthat the clamp may be easily taken off of the cable, for when the strain is relieved on rope J the lever H is thrown back 5 IOO ings, forconsiderable variation may be made from what is shown without changing the principle of action. 7

One pair of clamps is adapted. to several 5 sizes of cables smaller than the largest size it will receive by simply applying bushings to the concave surfaces to fit the smaller-sized cables, the bushings being held in position by any ordinary means for the purpose. 10 I claim as my invention- The combination in a cable clamp having two opposite portions, each having a concave face in contact with the cable, a series of wedges on one portion and a series of lugs 15 adapted to receive the wedges of the other, a

GEORGE W. DENNIS. Witnesses:

J. O. (JUSHMAN, L. E. ALLEN. 

